PDF malware analysis — malicious · 327917f5d97fcdb2

MALICIOUS

PDF

26.9 KB

MD5: 08ab26ec72505d5c2eea8fb709cc65c2 SHA-1: 595af94bbd971bcd698d377ea9d37a493548870f SHA-256: 327917f5d97fcdb25cdac445bcfdc40429d10d799915821d77220f4728a44bca

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and exhibits multiple indicators of malicious JavaScript execution. The presence of PDF_JAVASCRIPT, PDF_JS, and PDF_FILTER_HEX/85 rules, combined with the high ML score, strongly suggests the document is designed to exploit a vulnerability and run embedded JavaScript. The exact purpose of the script is unclear due to obfuscation, but it is likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS

PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

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